Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4b059e2b356014…

MALICIOUS

PDF

68.7 KB Created: 2021-09-29 10:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 270aec2bd416a3745f1b184545cb2d58 SHA-1: 11b81cd79f5c44b90a25f28e79a0c6e0dc1cb40d SHA-256: 8c4b059e2b356014f61c9b3983084b5b45509454827e27edc49081ba3aa08494
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF file exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing a large number of external links. The presence of multiple links pointing to compromised CMS upload directories and disposable hosting suggests an attempt at SEO poisoning or redirecting users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://rainwater.cc/images/uploads/files/48619055707.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3d44518e7---93570567186.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614faeb90acde---vedirugixaru.pdf
    • https://pabxlg.com/userfiles/file/5988073248.pdf
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/36481177299.pdf
    • http://murzilka.biz/images/uploads/file/zivepifefepukixeti.pdf
    • http://rebeccaosborne.com/uploads/xaxivosonikanifolotu.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc3501ecd5---87381836500.pdf
    • http://ghettaetamionarchitetti.it/userfiles/files/polopuxanelule.pdf
    • https://ikomsolutions.com/admin/userfiles/file/pivigusetuza.pdf
    • http://chrislahoda.ca/userfiles/file/65559530487.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138605d8c613---30722650016.pdf
    • https://maintogelonline2.org/contents/files/94837233661.pdf
    • http://chafewyuok.handysociality.com/upload/files/14306533712.pdf
    • http://pachinkoevent.com/sites/default/files/file/92532544181.pdf
    • http://bwlpsalisbury.com/uploads/files/35494773230.pdf
    • https://officialbacknumber.org/editor_up/texugojoloraso.pdf
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/monoralig.pdf
    • https://salwangurugram.com/files/danavek.pdf
    • https://gres-k.cat/userfiles/file/88349635257.pdf
    • http://njuhome.pl/ckfinder/userfiles/files/gunaf.pdf
    • http://fibertechnique.com/tmp/file/divutiwapifajig.pdf
    • https://tefen67.com/userfiles/files/pewodotit.pdf
    • https://cartolmania.it/file/zumunalugunutavatutofubos.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=justice+league+watch+online+123
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aece.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAECE 16792 bytes
font_01_sfnt_off0000c6e0.bin
76937654f7213df0d642d57389c2f5bc3e083bbdcbff9c958a0c4aa5c20cd4fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E0 14140 bytes
font_02_sfnt_off0000ea0f.bin
4b08763d89ab4ba50ff72e5bf0510aaf579504f37c47bf8de987400456a7f376
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0F 10928 bytes